Gamboa, a former featherweight champion with a record of 21-0, will face Farenas in the undercard of the Manny Pacquiao-Juan Manuel Marquez fight at the MGM Grand.

It will be Gamboa’s first fight in over a year and Arum told Ronnie Nathanielsz of PhilBoxing that the Cuban’s inactivity may work in Farenas’ favor.

“(Gamboa) hasn’t fought in over a year, and Farenas can take advantage of that,” Arum pointed out.

Gamboa last fought in September 2011, beating Daniel Ponce de Leon via technical decision after eight rounds. He since got into a contractual dispute with Top Rank before eventually ending up on rapper-promoter Curtis “50 Cent” Jackson’s SMS Promotions.

Farenas, for his part, is on an eight-fight unbeaten streak, although his last bout was a technical draw to Japan’s Takayashi Uchiyama.

Although Arum is not ruling out the upset, Farenas will still be a major underdog against Gamboa, a former Olympic gold medalist who has also held a featherweight title.